摘要
该文设计了一种高压水射流破煤性能测试实验平台,平台的射流发生系统、运动控制系统和煤样加载系统相互配合,用于研究不同射流参数下的煤岩体破碎规律,并进一步结合多种测量和分析手段,获得用于指导工程实践的实验数据。该文以垂直摆阵射流破煤实验为例,在实验平台开展了射流压力、冲击靶距、喷嘴直径、摆动速度和振动频率对射流破煤体积的影响规律研究,并用极差和方差分析方法探明了各种因素对垂直摆阵射流破煤体积的影响程度。高压水射流破煤性能测试实验平台具有操作简便安全、功能丰富等优点,可支撑科研与教学创新发展。
[Objective]High-pressure water jets are innovative tools for specialized coal and rock fragmentation.They are widely used in shale oil extraction,coal mining,tunnel excavation,and gas extraction,achieving significant engineering success.However,fracturing coal and rock masses with high-pressure water jets is a complex,nonlinear,dynamic process.Jet performance depends not only on parameters such as jet form,jet pressure,and flow rate but also on coal properties such as coal strength and natural fractures.This unpredictability poses challenges for research and teaching on coal-breaking techniques using high-pressure water jets.[Methods]To support scientific research and teaching on coal and rock fragmentation,this study designed an experimental platform for testing the performance of high-pressure water jets.The platform integrates a jet generation system,motion control system,and coal sample loading system,enabling experimental research on coal rock fragmentation with high-pressure water jets in various scenarios.The jet generation system generates high-pressure water jets with a maximum pressure of 40 MPa and a flow rate of 300 L/min.It includes a servo control system for precise adjustment of flow rates and pressures.The motion control system controls the horizontal movement and vertical oscillation of the jet nozzle,supporting functions such as fixed-point spraying,mobile cutting,and pendulum crushing.The coal sample loading system,driven by a hydraulic pump station,applies vertical and horizontal loads to coal samples to replicate real-world confining stress conditions.Vertical swing jet coal-breaking experiments conducted on this platform analyzed the impact of variables such as jet pressure,target distance,nozzle diameter,swing speed,and vibration frequency on coal-breaking efficiency.The range and variance analysis methods were used to examine the influence of various factors on the efficiency of vertical swing jet coal breaking.[Results]The results revealed that the volume of coal broken increases with jet pressure and nozzle diameter,decreases with impact target distance and swing speed,and follows a trend of increasing initially and then decreasing with vibration frequency.Among these factors,nozzle diameter had the greatest impact on coal-breaking volume,followed by swing speed,vibration frequency,and impact target distance.Jet pressure had the least impact.The optimal combination of jet and motion parameters was P=16 MPa,H=0.5 m,d=3 mm,T=50 mm/s,and f=3 r/s.Notably,only nozzle diameter showed a statistically significant effect on coal-breaking volume,while the other factors had no substantial impact.[Conclusions]The high-pressure water jet coal-breaking performance testing experimental platform is characterized by ease of operation,safety,and multifunctionality.It provides important support for scientific research and teaching innovation in the field of high-pressure water jet technology.
作者
王凤超
许瑞
陈嘉涵
吴楠楠
王利军
WANG Fengchao;XU Rui;CHEN Jiahan;WU Nannan;WANG Lijun(School of Low-Carbon Energy and Power Engineering,China University of Mining and Technology,Xuzhou 221116,China)
出处
《实验技术与管理》
北大核心
2025年第5期147-154,共8页
Experimental Technology and Management
基金
国家自然科学基金项目(52104150)
中国矿业大学教学研究项目(2024JY054)
中国矿业大学教学研究重点项目(2023ZDKT04)。
关键词
高压水射流
煤岩体破碎
实验平台
性能评价
high-pressure water jet
coal rock breaking
experimental platform
performance evaluation
